OLED might be replaced by Micro LED screens in the Apple Watch.
Two years ago, Apple bought a company called LuxVue. The company developed low-power micro LED displays. These displays use less power than OLED. According to Taiwanese supply chain sources of Digitimes, Apple plans to replace OLED with micro LED displays in 2017.
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Micro LED ranges in size from 1-micron to 100-micron. The production cost is higher than that for OLED panels at the moment. The biggest gain is the power consumption, a big topic for the Apple Watch, which requires to be charged every day.
The Apple Watch 2, expected to be unveiled in September, will still have an OLED display. If the report is true, then not only will the 2017 iPhone get a new display technology, but also the Apple Watch 3.
Apple is reportedly adopting OLED in the 10th anniversary iPhone.
microLED, also known as micro-LED, mLED or µLED, is an emerging flat panel display technology. As the name implies, mLED displays consist of arrays of microscopic LEDs forming the individual pixel elements. Compared to the widespread LCD technology, mLED displays offer far greater contrast, much faster response times, and would use less energy.
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Along with OLEDs, mLEDs are primarily aimed at small, low-energy devices such as smartwatches and similar. OLED and mLED both offer greatly reduced energy requirements compared to conventional LCD systems. Unlike OLED, mLED is based on conventional GaN LED technology, which offers far higher total brightness than OLED products, as much as 30 times, as well as higher efficiency in term. Via Wikipedia.